Reland "[recipes] Use named caches for git and workdirs"

This reverts commit 01d3eb64e7b11b22cf206758f01b06a7ae0bbb20.

Bug: skia:
Change-Id: Ic05b89009eb59a231488bef382dd232a50d2b00f
Reviewed-on: https://skia-review.googlesource.com/124260
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Eric Boren <borenet@google.com>

54 files changed, 830 insertions, 820 deletions

diff --git a/infra/bots/recipes/bookmaker.expected/nightly_bookmaker.json b/infra/bots/recipes/bookmaker.expected/nightly_bookmaker.json
index 863a924f3f..eead16ebe1 100644
--- a/infra/bots/recipes/bookmaker.expected/nightly_bookmaker.json
+++ b/infra/bots/recipes/bookmaker.expected/nightly_bookmaker.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -149,7 +149,7 @@
       "-e",
       "[START_DIR]/fiddle.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -170,7 +170,7 @@
       "--logtostderr",
       "--force"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -192,7 +192,7 @@
       "[START_DIR]/fiddleout.json",
       "/path/to/tmp/"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "GOPATH": "[START_DIR]/gopath",
       "GOROOT": "[START_DIR]/go/go",
@@ -206,7 +206,7 @@
       "cat",
       "[START_DIR]/fiddleout.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -220,13 +220,13 @@
   {
     "cmd": [
       "python",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/upload_md.py",
+      "[START_DIR]/cache/work/skia/infra/bots/upload_md.py",
       "--bookmaker_binary",
       "[START_DIR]/build/out/Release/bookmaker",
       "--fiddlecli_output",
       "[START_DIR]/fiddleout.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/bookmaker.expected/nightly_failed_extract_fiddles.json b/infra/bots/recipes/bookmaker.expected/nightly_failed_extract_fiddles.json
index e5f591f9bd..9ffbb61ade 100644
--- a/infra/bots/recipes/bookmaker.expected/nightly_failed_extract_fiddles.json
+++ b/infra/bots/recipes/bookmaker.expected/nightly_failed_extract_fiddles.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -149,7 +149,7 @@
       "-e",
       "[START_DIR]/fiddle.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddlecli.json b/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddlecli.json
index db15d5b9f5..2774b50b61 100644
--- a/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddlecli.json
+++ b/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddlecli.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -149,7 +149,7 @@
       "-e",
       "[START_DIR]/fiddle.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -170,7 +170,7 @@
       "--logtostderr",
       "--force"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddles.json b/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddles.json
index f2ea70cb9f..9fab0f5ddc 100644
--- a/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddles.json
+++ b/infra/bots/recipes/bookmaker.expected/nightly_failed_fiddles.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -149,7 +149,7 @@
       "-e",
       "[START_DIR]/fiddle.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -170,7 +170,7 @@
       "--logtostderr",
       "--force"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -192,7 +192,7 @@
       "[START_DIR]/fiddleout.json",
       "/path/to/tmp/"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "GOPATH": "[START_DIR]/gopath",
       "GOROOT": "[START_DIR]/go/go",
@@ -206,7 +206,7 @@
       "cat",
       "[START_DIR]/fiddleout.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/bookmaker.expected/nightly_failed_upload.json b/infra/bots/recipes/bookmaker.expected/nightly_failed_upload.json
index 3d2966381a..60ccebe788 100644
--- a/infra/bots/recipes/bookmaker.expected/nightly_failed_upload.json
+++ b/infra/bots/recipes/bookmaker.expected/nightly_failed_upload.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -149,7 +149,7 @@
       "-e",
       "[START_DIR]/fiddle.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -170,7 +170,7 @@
       "--logtostderr",
       "--force"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -184,13 +184,13 @@
   {
     "cmd": [
       "python",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/upload_md.py",
+      "[START_DIR]/cache/work/skia/infra/bots/upload_md.py",
       "--bookmaker_binary",
       "[START_DIR]/build/out/Release/bookmaker",
       "--fiddlecli_output",
       "[START_DIR]/fiddleout.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/bookmaker.expected/percommit_bookmaker.json b/infra/bots/recipes/bookmaker.expected/percommit_bookmaker.json
index 4294790c4c..3a0e4aa58e 100644
--- a/infra/bots/recipes/bookmaker.expected/percommit_bookmaker.json
+++ b/infra/bots/recipes/bookmaker.expected/percommit_bookmaker.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -148,7 +148,7 @@
       "docs/status.json",
       "-x"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/bookmaker.expected/percommit_failed_validation.json b/infra/bots/recipes/bookmaker.expected/percommit_failed_validation.json
index b91cf84486..f15a9ef22b 100644
--- a/infra/bots/recipes/bookmaker.expected/percommit_failed_validation.json
+++ b/infra/bots/recipes/bookmaker.expected/percommit_failed_validation.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -148,7 +148,7 @@
       "docs/status.json",
       "-x"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/check_generated_files.expected/Housekeeper-PerCommit-CheckGeneratedFiles.json b/infra/bots/recipes/check_generated_files.expected/Housekeeper-PerCommit-CheckGeneratedFiles.json
index 7c9fe21dab..af5f08e271 100644
--- a/infra/bots/recipes/check_generated_files.expected/Housekeeper-PerCommit-CheckGeneratedFiles.json
+++ b/infra/bots/recipes/check_generated_files.expected/Housekeeper-PerCommit-CheckGeneratedFiles.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -114,7 +114,7 @@
       "diff",
       "--no-ext-diff"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -128,9 +128,9 @@
     "cmd": [
       "python",
       "-u",
-      "import os\nimport subprocess\n\nfor r, d, files in os.walk('[CUSTOM_/_B_WORK]/skia'):\n  for f in files:\n    if f.endswith('.fp'):\n      path = os.path.join(r, f)\n      print 'touch %s' % path\n      subprocess.check_call(['touch', path])\n"
+      "import os\nimport subprocess\n\nfor r, d, files in os.walk('[START_DIR]/cache/work/skia'):\n  for f in files:\n    if f.endswith('.fp'):\n      path = os.path.join(r, f)\n      print 'touch %s' % path\n      subprocess.check_call(['touch', path])\n"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -142,7 +142,7 @@
       "@@@STEP_LOG_LINE@python.inline@import os@@@",
       "@@@STEP_LOG_LINE@python.inline@import subprocess@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
-      "@@@STEP_LOG_LINE@python.inline@for r, d, files in os.walk('[CUSTOM_/_B_WORK]/skia'):@@@",
+      "@@@STEP_LOG_LINE@python.inline@for r, d, files in os.walk('[START_DIR]/cache/work/skia'):@@@",
       "@@@STEP_LOG_LINE@python.inline@  for f in files:@@@",
       "@@@STEP_LOG_LINE@python.inline@    if f.endswith('.fp'):@@@",
       "@@@STEP_LOG_LINE@python.inline@      path = os.path.join(r, f)@@@",
@@ -155,9 +155,9 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -171,9 +171,9 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-clang-format"
+      "[START_DIR]/cache/work/skia/bin/fetch-clang-format"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -185,16 +185,16 @@
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
       "[START_DIR]/build/out/Release",
       "--args=is_debug=false skia_compile_processors=true skia_generate_workarounds=true"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "PATH": "[CUSTOM_/_B_WORK]/skia/bin:<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
+      "PATH": "[START_DIR]/cache/work/skia/bin:<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
       "SKIA_OUT": "[START_DIR]/build/out"
     },
     "name": "gn gen"
@@ -207,11 +207,11 @@
       "-C",
       "[START_DIR]/build/out/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "PATH": "[CUSTOM_/_B_WORK]/skia/bin:<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
+      "PATH": "[START_DIR]/cache/work/skia/bin:<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
       "SKIA_OUT": "[START_DIR]/build/out"
     },
     "name": "ninja"
@@ -222,7 +222,7 @@
       "diff",
       "--no-ext-diff"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -238,7 +238,7 @@
       "-u",
       "\ndiff1 = ''''''\n\ndiff2 = ''''''\n\nif diff1 != diff2:\n  print 'Generated files have been edited!'\n  exit(1)\n"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm-Release-Chromebook_GLES.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm-Release-Chromebook_GLES.json
index 9c1347a57a..5420fdbdc5 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm-Release-Chromebook_GLES.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm-Release-Chromebook_GLES.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,33 +111,33 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "LD_LIBRARY_PATH": "[START_DIR]/armhf_sysroot/lib",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES/Release",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_asmflags=[\"--target=armv7a-linux-gnueabihf\", \"--sysroot=[START_DIR]/armhf_sysroot\", \"-march=armv7-a\", \"-mfpu=neon\", \"-mthumb\"] extra_cflags=[\"--target=armv7a-linux-gnueabihf\", \"--sysroot=[START_DIR]/armhf_sysroot\", \"-I[START_DIR]/chromebook_arm_gles/include\", \"-I[START_DIR]/armhf_sysroot/include\", \"-I[START_DIR]/armhf_sysroot/include/c++/4.8.4\", \"-I[START_DIR]/armhf_sysroot/include/c++/4.8.4/arm-linux-gnueabihf\", \"-DMESA_EGL_NO_X11_HEADERS\", \"-DDUMMY_clang_linux_version=42\"] extra_ldflags=[\"--target=armv7a-linux-gnueabihf\", \"--sysroot=[START_DIR]/armhf_sysroot\", \"-B[START_DIR]/armhf_sysroot/bin\", \"-B[START_DIR]/armhf_sysroot/gcc-cross\", \"-L[START_DIR]/armhf_sysroot/gcc-cross\", \"-L[START_DIR]/armhf_sysroot/lib\", \"-L[START_DIR]/chromebook_arm_gles/lib\"] is_debug=false skia_use_egl=true skia_use_fontconfig=false skia_use_system_freetype2=false target_cpu=\"arm\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "LD_LIBRARY_PATH": "[START_DIR]/armhf_sysroot/lib",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES"
     },
     "name": "gn gen"
   },
@@ -147,17 +147,17 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES/Release",
       "nanobench",
       "dm"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "LD_LIBRARY_PATH": "[START_DIR]/armhf_sysroot/lib",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES"
     },
     "name": "ninja"
   },
@@ -166,7 +166,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm-Release-Chromebook_GLES/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android.json
index d599a982a7..0b45c75184 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/android_ndk_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/android_ndk_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android/Release",
       "--args=extra_cflags=[\"-DDUMMY_ndk_version=42\"] is_debug=false ndk=\"[START_DIR]/android_ndk_linux\" target_cpu=\"arm64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_ASAN.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_ASAN.json
index 0289a8c90a..d85851881a 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_ASAN.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_ASAN.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/android_ndk_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/android_ndk_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN/Release",
       "--args=extra_cflags=[\"-DDUMMY_ndk_version=42\"] is_debug=false ndk=\"[START_DIR]/android_ndk_linux\" sanitize=\"ASAN\" target_cpu=\"arm64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_ASAN/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_Vulkan.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_Vulkan.json
index 33caf89374..cc1e4d6378 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_Vulkan.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-arm64-Release-Android_Vulkan.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/android_ndk_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/android_ndk_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan/Release",
       "--args=extra_cflags=[\"-DDUMMY_ndk_version=42\"] is_debug=false ndk=\"[START_DIR]/android_ndk_linux\" ndk_api=24 skia_enable_vulkan_debug_layers=false target_cpu=\"arm64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-arm64-Release-Android_Vulkan/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-ASAN.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-ASAN.json
index a37663135b..c98221e26b 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-ASAN.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-ASAN.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN/Debug",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\", \"-O1\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\"] sanitize=\"ASAN\" skia_enable_spirv_validation=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-ASAN/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-Coverage.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-Coverage.json
index f39e749913..2d431b9441 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-Coverage.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-Coverage.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage/Debug",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\", \"-fprofile-instr-generate\", \"-fcoverage-mapping\", \"-O1\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\", \"-fprofile-instr-generate\", \"-fcoverage-mapping\"] target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-Coverage/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-MSAN.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-MSAN.json
index 2e6cc03228..c56489e070 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-MSAN.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-MSAN.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN/Debug",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\", \"-O1\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\", \"-L[START_DIR]/clang_linux/msan\"] sanitize=\"MSAN\" skia_enable_gpu=false skia_use_fontconfig=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-MSAN/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE.json
index 3d768982e8..0e7a0773f9 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE/Debug",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\", \"-O1\", \"-DSK_USE_DISCARDABLE_SCALEDIMAGECACHE\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\"] target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug-SK_USE_DISCARDABLE_SCALEDIMAGECACHE/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug.json
index 4609686176..04a40898b2 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Debug.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug/Debug",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\", \"-O1\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\"] target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Debug/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Debug/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES.json
index baeb043392..9b04276e12 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES/Release",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_asmflags=[] extra_cflags=[\"-DMESA_EGL_NO_X11_HEADERS\", \"-I[START_DIR]/chromebook_x86_64_gles/include\", \"-DDUMMY_clang_linux_version=42\"] extra_ldflags=[\"-L[START_DIR]/chromebook_x86_64_gles/lib\", \"-static-libstdc++\", \"-static-libgcc\", \"-fuse-ld=lld\"] is_debug=false skia_use_egl=true skia_use_fontconfig=false skia_use_system_freetype2=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES"
     },
     "name": "gn gen"
   },
@@ -145,16 +145,16 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES/Release",
       "nanobench",
       "dm"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES"
     },
     "name": "ninja"
   },
@@ -163,7 +163,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Chromebook_GLES/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Fast.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Fast.json
index c6401011a0..6eba4867c2 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Fast.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Fast.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Fast"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Fast"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Fast/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Fast/Release",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\", \"-march=native\", \"-fomit-frame-pointer\", \"-O3\", \"-ffp-contract=off\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\"] is_debug=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Fast"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Fast"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Fast/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Fast/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Fast"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Fast"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Fast/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Fast/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Mini.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Mini.json
index c68d6efc05..ec5c41e3fa 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Mini.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Mini.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Mini"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Mini"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Mini/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Mini/Release",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\"] is_component_build=true is_debug=false is_official_build=true skia_enable_effects=false skia_enable_gpu=true skia_enable_pdf=false skia_use_expat=false skia_use_libjpeg_turbo=false skia_use_libpng=false skia_use_libwebp=false skia_use_zlib=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Mini"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Mini"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Mini/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Mini/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Mini"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Mini"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Mini/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Mini/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan.json
index ef650cb57e..683e5ff031 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan/Release",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\"] is_debug=false skia_enable_vulkan_debug_layers=false skia_vulkan_sdk=\"[START_DIR]/linux_vulkan_sdk\" target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage.json b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage.json
index dd557b5bc1..692ed1096f 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/clang_linux/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_linux/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage/Release",
       "--args=cc=\"[START_DIR]/clang_linux/bin/clang\" cxx=\"[START_DIR]/clang_linux/bin/clang++\" extra_cflags=[\"-B[START_DIR]/clang_linux/bin\", \"-DDUMMY_clang_linux_version=42\", \"-fprofile-instr-generate\", \"-fcoverage-mapping\"] extra_ldflags=[\"-B[START_DIR]/clang_linux/bin\", \"-fuse-ld=lld\", \"-fprofile-instr-generate\", \"-fcoverage-mapping\"] is_debug=false skia_enable_vulkan_debug_layers=false skia_vulkan_sdk=\"[START_DIR]/linux_vulkan_sdk\" target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-Clang-x86_64-Release-Vulkan_Coverage/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-EMCC-wasm-Release.json b/infra/bots/recipes/compile.expected/Build-Debian9-EMCC-wasm-Release.json
index 99b1593c2c..828a82a3ff 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-EMCC-wasm-Release.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-EMCC-wasm-Release.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/emscripten_sdk/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/emscripten_sdk/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-EMCC-wasm-Release"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-EMCC-wasm-Release"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-EMCC-wasm-Release/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-EMCC-wasm-Release/Release",
       "--args=cc=\"[START_DIR]/emscripten_sdk/emscripten/incoming/emcc\" cxx=\"[START_DIR]/emscripten_sdk/emscripten/incoming/em++\" extra_cflags=[\"-Wno-unknown-warning-option\", \"-DDUMMY_emscripten_sdk_version=42\"] is_debug=false skia_enable_gpu=false skia_use_dng_sdk=false skia_use_fontconfig=false skia_use_freetype=false skia_use_icu=false target_cpu=\"wasm\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "[START_DIR]/emscripten_sdk/clang/fastcomp/build_incoming_64/bin:<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-EMCC-wasm-Release"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-EMCC-wasm-Release"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-EMCC-wasm-Release/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-EMCC-wasm-Release/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "[START_DIR]/emscripten_sdk/clang/fastcomp/build_incoming_64/bin:<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-EMCC-wasm-Release"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-EMCC-wasm-Release"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-EMCC-wasm-Release/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-EMCC-wasm-Release/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-arm-Release-Chromecast.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-arm-Release-Chromecast.json
index 32fcb01603..e9a935e4c2 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-arm-Release-Chromecast.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-arm-Release-Chromecast.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/cast_toolchain/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/cast_toolchain/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-arm-Release-Chromecast"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-arm-Release-Chromecast"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-arm-Release-Chromecast/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-arm-Release-Chromecast/Release",
       "--args=ar=\"[START_DIR]/cast_toolchain/armv7a/bin/armv7a-cros-linux-gnueabi-ar\" cc=\"[START_DIR]/cast_toolchain/armv7a/bin/armv7a-cros-linux-gnueabi-gcc\" cxx=\"[START_DIR]/cast_toolchain/armv7a/bin/armv7a-cros-linux-gnueabi-g++\" extra_cflags=[\"-I[START_DIR]/chromebook_arm_gles/include\", \"-DMESA_EGL_NO_X11_HEADERS\", \"-DSK_NO_COMMAND_BUFFER\", \"-Wno-error=unused-function\", \"-g0\", \"-DDUMMY_cast_toolchain_version=42\"] extra_ldflags=[\"-static-libstdc++\", \"-static-libgcc\", \"-L[START_DIR]/cast_toolchain/armv7a/lib\"] is_debug=false skia_enable_gpu=true skia_use_egl=true skia_use_fontconfig=false skia_use_icu=false skia_use_system_freetype2=false target_cpu=\"arm\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-arm-Release-Chromecast"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-arm-Release-Chromecast"
     },
     "name": "gn gen"
   },
@@ -145,16 +145,16 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-arm-Release-Chromecast/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-arm-Release-Chromecast/Release",
       "nanobench",
       "dm"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-arm-Release-Chromecast"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-arm-Release-Chromecast"
     },
     "name": "ninja"
   },
@@ -163,7 +163,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-arm-Release-Chromecast/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-arm-Release-Chromecast/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86-Debug.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86-Debug.json
index 0988830980..488a3d400d 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86-Debug.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86-Debug.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -97,31 +97,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86-Debug"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86-Debug"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86-Debug/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86-Debug/Debug",
       "--args=cc=\"gcc\" cxx=\"g++\" extra_cflags=[\"-O1\"] target_cpu=\"x86\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86-Debug"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86-Debug"
     },
     "name": "gn gen"
   },
@@ -131,14 +131,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86-Debug/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86-Debug/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86-Debug"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86-Debug"
     },
     "name": "ninja"
   },
@@ -147,7 +147,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86-Debug/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86-Debug/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Debug-NoGPU.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Debug-NoGPU.json
index 0c64b0cba0..184ad85069 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Debug-NoGPU.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Debug-NoGPU.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -97,31 +97,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU/Debug",
       "--args=cc=\"gcc\" cxx=\"g++\" extra_cflags=[\"-O1\"] skia_enable_gpu=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU"
     },
     "name": "gn gen"
   },
@@ -131,14 +131,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU"
     },
     "name": "ninja"
   },
@@ -147,7 +147,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Debug-NoGPU/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-ANGLE.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-ANGLE.json
index 28197f8e70..2ddf353a64 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-ANGLE.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-ANGLE.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -97,31 +97,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE/Release",
       "--args=cc=\"gcc\" cxx=\"g++\" is_debug=false skia_use_angle=true target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE"
     },
     "name": "gn gen"
   },
@@ -131,14 +131,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE"
     },
     "name": "ninja"
   },
@@ -147,7 +147,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-ANGLE/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Flutter_Android.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Flutter_Android.json
index 9cc8e47e89..a824cfa38f 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Flutter_Android.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Flutter_Android.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]/flutter"
+      "[START_DIR]/cache/work/flutter"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/flutter/.gclient_entries"
+      "[START_DIR]/cache/work/flutter/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/flutter/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/flutter/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://github.com/flutter/engine.git'}]\ntarget_os = ['android']",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://github.com/flutter/engine.git'}]\ntarget_os = ['android']",
       "--patch_root",
       "src/third_party/skia",
       "--revision_mapping_file",
       "{\"got_flutter_revision\": \"src/flutter\", \"got_revision\": \"src/third_party/skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -49,7 +49,7 @@
       "--revision",
       "src/third_party/skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter",
+    "cwd": "[START_DIR]/cache/work/flutter",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -117,7 +117,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "env": {
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
     },
@@ -131,9 +131,9 @@
       "--json-output",
       "/path/to/tmp/json",
       "rmtree",
-      "[CUSTOM_/_B_WORK]/flutter/src/out/android_release"
+      "[START_DIR]/cache/work/flutter/src/out/android_release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "infra_step": true,
     "name": "rmtree android_release"
   },
@@ -143,12 +143,12 @@
       "--runtime-mode=release",
       "--android"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
     },
     "name": "gn_gen"
   },
@@ -159,12 +159,12 @@
       "out/android_release",
       "-j100"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
     },
     "name": "build_flutter"
   },
@@ -173,7 +173,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android/Release",
+      "[START_DIR]/cache/work/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium.json
index 2592241d42..b14dd5668d 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]",
       "--patch_root",
       "pdfium/third_party/skia",
       "--revision_mapping_file",
       "{\"got_pdfium_revision\": \"pdfium\", \"got_revision\": \"pdfium/third_party/skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -49,7 +49,7 @@
       "--revision",
       "pdfium/third_party/skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -117,7 +117,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
@@ -130,13 +130,13 @@
       "build/linux/sysroot_scripts/install-sysroot.py",
       "--arch=amd64"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
     },
     "name": "sysroot"
   },
@@ -147,14 +147,14 @@
       "out/skia",
       "--args=pdf_is_standalone=true clang_use_chrome_plugins=false is_component_build=false is_debug=false pdf_use_skia=true"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "CHROMIUM_BUILDTOOLS_PATH": "[CUSTOM_/_B_WORK]/pdfium/buildtools",
+      "CHROMIUM_BUILDTOOLS_PATH": "[START_DIR]/cache/work/pdfium/buildtools",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
     },
     "name": "gn_gen"
   },
@@ -165,14 +165,14 @@
       "out/skia",
       "-j100"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "CHROMIUM_BUILDTOOLS_PATH": "[CUSTOM_/_B_WORK]/pdfium/buildtools",
+      "CHROMIUM_BUILDTOOLS_PATH": "[START_DIR]/cache/work/pdfium/buildtools",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
     },
     "name": "build_pdfium"
   },
@@ -181,7 +181,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium/Release",
+      "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths.json
index 434c6b1539..c643894325 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]",
       "--patch_root",
       "pdfium/third_party/skia",
       "--revision_mapping_file",
       "{\"got_pdfium_revision\": \"pdfium\", \"got_revision\": \"pdfium/third_party/skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -49,7 +49,7 @@
       "--revision",
       "pdfium/third_party/skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -117,7 +117,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
@@ -130,13 +130,13 @@
       "build/linux/sysroot_scripts/install-sysroot.py",
       "--arch=amd64"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths"
     },
     "name": "sysroot"
   },
@@ -147,14 +147,14 @@
       "out/skia",
       "--args=pdf_is_standalone=true clang_use_chrome_plugins=false is_component_build=false is_debug=false pdf_use_skia_paths=true"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "CHROMIUM_BUILDTOOLS_PATH": "[CUSTOM_/_B_WORK]/pdfium/buildtools",
+      "CHROMIUM_BUILDTOOLS_PATH": "[START_DIR]/cache/work/pdfium/buildtools",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths"
     },
     "name": "gn_gen"
   },
@@ -165,14 +165,14 @@
       "out/skia",
       "-j100"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "CHROMIUM_BUILDTOOLS_PATH": "[CUSTOM_/_B_WORK]/pdfium/buildtools",
+      "CHROMIUM_BUILDTOOLS_PATH": "[START_DIR]/cache/work/pdfium/buildtools",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths"
     },
     "name": "build_pdfium"
   },
@@ -181,7 +181,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths/Release",
+      "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium_SkiaPaths/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Shared.json b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Shared.json
index 3dc69c4661..6bfeb1fabb 100644
--- a/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Shared.json
+++ b/infra/bots/recipes/compile.expected/Build-Debian9-GCC-x86_64-Release-Shared.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -97,31 +97,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-Shared"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-Shared"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-Shared/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-Shared/Release",
       "--args=cc=\"gcc\" cxx=\"g++\" is_component_build=true is_debug=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-Shared"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-Shared"
     },
     "name": "gn gen"
   },
@@ -131,14 +131,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-Shared/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-Shared/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-Shared"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-Shared"
     },
     "name": "ninja"
   },
@@ -147,7 +147,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Debian9-GCC-x86_64-Release-Shared/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Debian9-GCC-x86_64-Release-Shared/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-Android.json b/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-Android.json
index 5947f190cc..f6b6839b0f 100644
--- a/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-Android.json
+++ b/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-Android.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/android_ndk_darwin/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/android_ndk_darwin/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-Android"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-Android/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-Android/Debug",
       "--args=extra_cflags=[\"-O1\", \"-DDUMMY_ndk_version=42\"] ndk=\"[START_DIR]/android_ndk_darwin\" target_cpu=\"arm64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-Android"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-Android/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-Android/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-Android"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-Android/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-Android/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-iOS.json b/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-iOS.json
index d011552022..6cb43df8d9 100644
--- a/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-iOS.json
+++ b/infra/bots/recipes/compile.expected/Build-Mac-Clang-arm64-Debug-iOS.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -97,31 +97,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-iOS"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-iOS"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-iOS/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-iOS/Debug",
       "--args=cc=\"clang\" cxx=\"clang++\" extra_cflags=[\"-O1\"] skia_ios_identity=\".*GS9WA.*\" skia_ios_profile=\"Upstream Testing Provisioning Profile\" target_cpu=\"arm64\" target_os=\"ios\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-iOS"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-iOS"
     },
     "name": "gn gen"
   },
@@ -131,14 +131,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-iOS/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-iOS/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-iOS"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-iOS"
     },
     "name": "ninja"
   },
@@ -147,7 +147,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-arm64-Debug-iOS/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-arm64-Debug-iOS/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Mac-Clang-x64-Release-iOS.json b/infra/bots/recipes/compile.expected/Build-Mac-Clang-x64-Release-iOS.json
index 952ba1327a..5ba5ef217f 100644
--- a/infra/bots/recipes/compile.expected/Build-Mac-Clang-x64-Release-iOS.json
+++ b/infra/bots/recipes/compile.expected/Build-Mac-Clang-x64-Release-iOS.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -97,31 +97,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x64-Release-iOS"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x64-Release-iOS"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x64-Release-iOS/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x64-Release-iOS/Release",
       "--args=cc=\"clang\" cxx=\"clang++\" is_debug=false skia_ios_identity=\".*GS9WA.*\" skia_ios_profile=\"Upstream Testing Provisioning Profile\" target_cpu=\"x64\" target_os=\"ios\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x64-Release-iOS"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x64-Release-iOS"
     },
     "name": "gn gen"
   },
@@ -131,14 +131,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x64-Release-iOS/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x64-Release-iOS/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x64-Release-iOS"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x64-Release-iOS"
     },
     "name": "ninja"
   },
@@ -147,7 +147,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x64-Release-iOS/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x64-Release-iOS/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Debug-CommandBuffer.json b/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Debug-CommandBuffer.json
index 9a1bd71949..0f05d1410f 100644
--- a/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Debug-CommandBuffer.json
+++ b/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Debug-CommandBuffer.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -49,7 +49,7 @@
       "--revision",
       "src@origin/lkcr"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -103,7 +103,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env": {
       "DEPOT_TOOLS_UPDATE": "0",
       "GYP_CHROMIUM_NO_ACTION": "0",
@@ -115,11 +115,11 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/tools/build_command_buffer.py",
+      "[START_DIR]/cache/work/skia/tools/build_command_buffer.py",
       "--chrome-dir",
-      "[CUSTOM_/_B_WORK]",
+      "[START_DIR]/cache/work",
       "--output-dir",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug",
       "--no-sync",
       "--no-hooks",
       "--make-output-dir"
@@ -128,7 +128,7 @@
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
     },
     "name": "build command_buffer"
   },
@@ -136,31 +136,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug",
       "--args=cc=\"clang\" cxx=\"clang++\" extra_cflags=[\"-O1\"] target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
     },
     "name": "gn gen"
   },
@@ -170,14 +170,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug"
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer"
     },
     "name": "ninja"
   },
@@ -186,7 +186,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Debug-CommandBuffer/Debug",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Release.json b/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Release.json
index f4eb37af08..f949ec89e3 100644
--- a/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Release.json
+++ b/infra/bots/recipes/compile.expected/Build-Mac-Clang-x86_64-Release.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -97,31 +97,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Release"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Release"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/bin/gn",
+      "[START_DIR]/cache/work/skia/bin/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Release/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Release/Release",
       "--args=cc=\"clang\" cxx=\"clang++\" is_debug=false target_cpu=\"x86_64\""
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Release"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Release"
     },
     "name": "gn gen"
   },
@@ -131,14 +131,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Release/Release"
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Release/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Release"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Release"
     },
     "name": "ninja"
   },
@@ -147,7 +147,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/skia/out/Build-Mac-Clang-x86_64-Release/Release",
+      "[START_DIR]/cache/work/skia/out/Build-Mac-Clang-x86_64-Release/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Win-Clang-arm64-Release-Android.json b/infra/bots/recipes/compile.expected/Build-Win-Clang-arm64-Release-Android.json
index 77b178832f..22a2bbf0eb 100644
--- a/infra/bots/recipes/compile.expected/Build-Win-Clang-arm64-Release-Android.json
+++ b/infra/bots/recipes/compile.expected/Build-Win-Clang-arm64-Release-Android.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_C:\\_B_WORK]"
+      "[START_DIR]\\cache\\work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+      "[START_DIR]\\cache\\work\\.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+    "name": "remove [START_DIR]\\cache\\work\\.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_C:\\\\_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]\\\\cache\\\\git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_C:\\_B_CACHE]",
+      "[START_DIR]\\cache\\git",
       "--cleanup-dir",
       "[CLEANUP]\\bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]",
+    "cwd": "[START_DIR]\\cache\\work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\infra\\bots\\assets\\android_ndk_windows\\VERSION",
+      "[START_DIR]\\cache\\work\\skia\\infra\\bots\\assets\\android_ndk_windows\\VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\fetch-gn"
+      "[START_DIR]\\cache\\work\\skia\\bin\\fetch-gn"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-arm64-Release-Android"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-arm64-Release-Android"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\gn.exe",
+      "[START_DIR]\\cache\\work\\skia\\bin\\gn.exe",
       "gen",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-arm64-Release-Android\\Release",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-arm64-Release-Android\\Release",
       "--args=extra_cflags=[\"-DDUMMY_ndk_version=42\"] is_debug=false ndk=\"[START_DIR]\\n\" target_cpu=\"arm64\""
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-arm64-Release-Android"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-arm64-Release-Android"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-arm64-Release-Android\\Release"
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-arm64-Release-Android\\Release"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-arm64-Release-Android"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-arm64-Release-Android"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-arm64-Release-Android\\Release",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-arm64-Release-Android\\Release",
       "[START_DIR]\\[SWARM_OUT_DIR]\\out\\Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug-Exceptions.json b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug-Exceptions.json
index 3f2c05a1b7..81800fb00d 100644
--- a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug-Exceptions.json
+++ b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug-Exceptions.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_C:\\_B_WORK]"
+      "[START_DIR]\\cache\\work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+      "[START_DIR]\\cache\\work\\.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+    "name": "remove [START_DIR]\\cache\\work\\.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_C:\\\\_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]\\\\cache\\\\git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_C:\\_B_CACHE]",
+      "[START_DIR]\\cache\\git",
       "--cleanup-dir",
       "[CLEANUP]\\bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]",
+    "cwd": "[START_DIR]\\cache\\work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
+      "[START_DIR]\\cache\\work\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\fetch-gn"
+      "[START_DIR]\\cache\\work\\skia\\bin\\fetch-gn"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\gn.exe",
+      "[START_DIR]\\cache\\work\\skia\\bin\\gn.exe",
       "gen",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions\\Debug",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions\\Debug",
       "--args=cc=\"clang\" clang_win=\"[START_DIR]\\clang_win\" cxx=\"clang++\" extra_cflags=[\"-O1\", \"/EHsc\", \"-DDUMMY_clang_win_version=42\"] target_cpu=\"x86\" win_sdk=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/win_sdk\" win_vc=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/VC\""
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions\\Debug"
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions\\Debug"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions\\Debug",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug-Exceptions\\Debug",
       "[START_DIR]\\[SWARM_OUT_DIR]\\out\\Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug.json b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug.json
index 74e4687d5c..57f5008026 100644
--- a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug.json
+++ b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86-Debug.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_C:\\_B_WORK]"
+      "[START_DIR]\\cache\\work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+      "[START_DIR]\\cache\\work\\.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+    "name": "remove [START_DIR]\\cache\\work\\.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_C:\\\\_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]\\\\cache\\\\git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_C:\\_B_CACHE]",
+      "[START_DIR]\\cache\\git",
       "--cleanup-dir",
       "[CLEANUP]\\bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]",
+    "cwd": "[START_DIR]\\cache\\work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
+      "[START_DIR]\\cache\\work\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\fetch-gn"
+      "[START_DIR]\\cache\\work\\skia\\bin\\fetch-gn"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\gn.exe",
+      "[START_DIR]\\cache\\work\\skia\\bin\\gn.exe",
       "gen",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug\\Debug",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug\\Debug",
       "--args=cc=\"clang\" clang_win=\"[START_DIR]\\clang_win\" cxx=\"clang++\" extra_cflags=[\"-O1\", \"-DDUMMY_clang_win_version=42\"] target_cpu=\"x86\" win_sdk=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/win_sdk\" win_vc=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/VC\""
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug\\Debug"
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug\\Debug"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86-Debug\\Debug",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86-Debug\\Debug",
       "[START_DIR]\\[SWARM_OUT_DIR]\\out\\Debug"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Debug-ANGLE.json b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Debug-ANGLE.json
index 04ec5b0bde..70fd9b6c3a 100644
--- a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Debug-ANGLE.json
+++ b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Debug-ANGLE.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_C:\\_B_WORK]"
+      "[START_DIR]\\cache\\work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+      "[START_DIR]\\cache\\work\\.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+    "name": "remove [START_DIR]\\cache\\work\\.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_C:\\\\_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]\\\\cache\\\\git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_C:\\_B_CACHE]",
+      "[START_DIR]\\cache\\git",
       "--cleanup-dir",
       "[CLEANUP]\\bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]",
+    "cwd": "[START_DIR]\\cache\\work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
+      "[START_DIR]\\cache\\work\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\fetch-gn"
+      "[START_DIR]\\cache\\work\\skia\\bin\\fetch-gn"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\gn.exe",
+      "[START_DIR]\\cache\\work\\skia\\bin\\gn.exe",
       "gen",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE\\Debug_x64",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE\\Debug_x64",
       "--args=cc=\"clang\" clang_win=\"[START_DIR]\\clang_win\" cxx=\"clang++\" extra_cflags=[\"-O1\", \"-DDUMMY_clang_win_version=42\"] skia_use_angle=true target_cpu=\"x86_64\" win_sdk=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/win_sdk\" win_vc=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/VC\""
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE\\Debug_x64"
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE\\Debug_x64"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Debug_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE\\Debug_x64",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Debug-ANGLE\\Debug_x64",
       "[START_DIR]\\[SWARM_OUT_DIR]\\out\\Debug_x64"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Release-Vulkan.json b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Release-Vulkan.json
index 9c662d0a46..bbd857c4e6 100644
--- a/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Release-Vulkan.json
+++ b/infra/bots/recipes/compile.expected/Build-Win-Clang-x86_64-Release-Vulkan.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_C:\\_B_WORK]"
+      "[START_DIR]\\cache\\work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+      "[START_DIR]\\cache\\work\\.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_C:\\_B_WORK]\\.gclient_entries"
+    "name": "remove [START_DIR]\\cache\\work\\.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_C:\\\\_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]\\\\cache\\\\git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_C:\\_B_CACHE]",
+      "[START_DIR]\\cache\\git",
       "--cleanup-dir",
       "[CLEANUP]\\bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]",
+    "cwd": "[START_DIR]\\cache\\work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
+      "[START_DIR]\\cache\\work\\skia\\infra\\bots\\assets\\clang_win\\VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\fetch-gn"
+      "[START_DIR]\\cache\\work\\skia\\bin\\fetch-gn"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_C:\\_B_WORK]\\skia\\bin\\gn.exe",
+      "[START_DIR]\\cache\\work\\skia\\bin\\gn.exe",
       "gen",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan\\Release_x64",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan\\Release_x64",
       "--args=cc=\"clang\" clang_win=\"[START_DIR]\\clang_win\" cxx=\"clang++\" extra_cflags=[\"-DDUMMY_clang_win_version=42\"] is_debug=false skia_enable_vulkan_debug_layers=false skia_vulkan_sdk=\"[START_DIR]\\win_vulkan_sdk\" target_cpu=\"x86_64\" win_sdk=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/win_sdk\" win_vc=\"[START_DIR]\\t\\depot_tools\\win_toolchain\\vs_files\\a9e1098bba66d2acccc377d5ee81265910f29272/VC\""
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan\\Release_x64"
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan\\Release_x64"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]\\skia",
+    "cwd": "[START_DIR]\\cache\\work\\skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>;RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_C:\\_B_WORK]\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan\\Release_x64",
+      "[START_DIR]\\cache\\work\\skia\\out\\Build-Win-Clang-x86_64-Release-Vulkan\\Release_x64",
       "[START_DIR]\\[SWARM_OUT_DIR]\\out\\Release_x64"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/alternate_repo.json b/infra/bots/recipes/compile.expected/alternate_repo.json
index 1f2410ca26..570c282e5e 100644
--- a/infra/bots/recipes/compile.expected/alternate_repo.json
+++ b/infra/bots/recipes/compile.expected/alternate_repo.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_C:\\_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_C:\\_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_C:\\_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_C:\\\\_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'other_repo', 'url': 'https://skia.googlesource.com/other_repo.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'other_repo', 'url': 'https://skia.googlesource.com/other_repo.git'}]",
       "--patch_root",
       "other_repo",
       "--revision_mapping_file",
       "{\"got_revision\": \"other_repo\"}",
       "--git-cache-dir",
-      "[CUSTOM_C:\\_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "other_repo@abc123"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -101,7 +101,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_C:\\_B_WORK]/skia/infra/bots/assets/clang_win/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_win/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -111,31 +111,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_C:\\_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_C:\\_B_WORK]/skia/bin/gn.exe",
+      "[START_DIR]/cache/work/skia/bin/gn.exe",
       "gen",
-      "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
+      "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
       "--args=cc=\"clang\" clang_win=\"[START_DIR]/clang_win\" cxx=\"clang++\" extra_cflags=[\"-DDUMMY_clang_win_version=42\"] is_debug=false skia_enable_vulkan_debug_layers=false skia_vulkan_sdk=\"[START_DIR]/win_vulkan_sdk\" target_cpu=\"x86_64\" win_sdk=\"[START_DIR]/t/depot_tools/win_toolchain/vs_files/a9e1098bba66d2acccc377d5ee81265910f29272/win_sdk\" win_vc=\"[START_DIR]/t/depot_tools/win_toolchain/vs_files/a9e1098bba66d2acccc377d5ee81265910f29272/VC\""
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "name": "gn gen"
   },
@@ -145,14 +145,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64"
+      "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "name": "ninja"
   },
@@ -161,7 +161,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
+      "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release_x64"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/flutter_trybot.json b/infra/bots/recipes/compile.expected/flutter_trybot.json
index 5f8cc36499..69c2d1c35e 100644
--- a/infra/bots/recipes/compile.expected/flutter_trybot.json
+++ b/infra/bots/recipes/compile.expected/flutter_trybot.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]/flutter"
+      "[START_DIR]/cache/work/flutter"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/flutter/.gclient_entries"
+      "[START_DIR]/cache/work/flutter/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/flutter/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/flutter/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://github.com/flutter/engine.git'}]\ntarget_os = ['android']",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://github.com/flutter/engine.git'}]\ntarget_os = ['android']",
       "--patch_root",
       "src/third_party/skia",
       "--revision_mapping_file",
       "{\"got_flutter_revision\": \"src/flutter\", \"got_revision\": \"src/third_party/skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--gerrit_repo",
@@ -53,7 +53,7 @@
       "--revision",
       "src/third_party/skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter",
+    "cwd": "[START_DIR]/cache/work/flutter",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -121,7 +121,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "env": {
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
     },
@@ -135,9 +135,9 @@
       "--json-output",
       "/path/to/tmp/json",
       "rmtree",
-      "[CUSTOM_/_B_WORK]/flutter/src/out/android_release"
+      "[START_DIR]/cache/work/flutter/src/out/android_release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "infra_step": true,
     "name": "rmtree android_release"
   },
@@ -147,12 +147,12 @@
       "--runtime-mode=release",
       "--android"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
     },
     "name": "gn_gen"
   },
@@ -163,12 +163,12 @@
       "out/android_release",
       "-j100"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/flutter/src",
+    "cwd": "[START_DIR]/cache/work/flutter/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
+      "SKIA_OUT": "[START_DIR]/cache/work/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android"
     },
     "name": "build_flutter"
   },
@@ -177,7 +177,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android/Release",
+      "[START_DIR]/cache/work/flutter/src/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-Flutter_Android/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/pdfium_trybot.json b/infra/bots/recipes/compile.expected/pdfium_trybot.json
index d4fbbcfa1b..737c92b7e6 100644
--- a/infra/bots/recipes/compile.expected/pdfium_trybot.json
+++ b/infra/bots/recipes/compile.expected/pdfium_trybot.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'pdfium', 'url': 'https://pdfium.googlesource.com/pdfium.git'}]",
       "--patch_root",
       "pdfium/third_party/skia",
       "--revision_mapping_file",
       "{\"got_pdfium_revision\": \"pdfium\", \"got_revision\": \"pdfium/third_party/skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--gerrit_repo",
@@ -53,7 +53,7 @@
       "--revision",
       "pdfium/third_party/skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -121,7 +121,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
@@ -134,13 +134,13 @@
       "build/linux/sysroot_scripts/install-sysroot.py",
       "--arch=amd64"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
     },
     "name": "sysroot"
   },
@@ -151,14 +151,14 @@
       "out/skia",
       "--args=pdf_is_standalone=true clang_use_chrome_plugins=false is_component_build=false is_debug=false pdf_use_skia=true"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "CHROMIUM_BUILDTOOLS_PATH": "[CUSTOM_/_B_WORK]/pdfium/buildtools",
+      "CHROMIUM_BUILDTOOLS_PATH": "[START_DIR]/cache/work/pdfium/buildtools",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
     },
     "name": "gn_gen"
   },
@@ -169,14 +169,14 @@
       "out/skia",
       "-j100"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/pdfium",
+    "cwd": "[START_DIR]/cache/work/pdfium",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
-      "CHROMIUM_BUILDTOOLS_PATH": "[CUSTOM_/_B_WORK]/pdfium/buildtools",
+      "CHROMIUM_BUILDTOOLS_PATH": "[START_DIR]/cache/work/pdfium/buildtools",
       "DEPOT_TOOLS_UPDATE": "0",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
+      "SKIA_OUT": "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium"
     },
     "name": "build_pdfium"
   },
@@ -185,7 +185,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_/_B_WORK]/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium/Release",
+      "[START_DIR]/cache/work/pdfium/third_party/skia/out/Build-Debian9-GCC-x86_64-Release-PDFium/Release",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/compile.expected/trybot.json b/infra/bots/recipes/compile.expected/trybot.json
index 6c30e1a347..d1728a19fb 100644
--- a/infra/bots/recipes/compile.expected/trybot.json
+++ b/infra/bots/recipes/compile.expected/trybot.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_C:\\_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_C:\\_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_C:\\_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_C:\\\\_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_C:\\_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--gerrit_repo",
@@ -51,7 +51,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -105,7 +105,7 @@
       "--json-output",
       "/path/to/tmp/json",
       "copy",
-      "[CUSTOM_C:\\_B_WORK]/skia/infra/bots/assets/clang_win/VERSION",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/clang_win/VERSION",
       "/path/to/tmp/"
     ],
     "infra_step": true,
@@ -115,31 +115,31 @@
     "cmd": [
       "python",
       "-u",
-      "[CUSTOM_C:\\_B_WORK]/skia/bin/fetch-gn"
+      "[START_DIR]/cache/work/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "infra_step": true,
     "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_C:\\_B_WORK]/skia/bin/gn.exe",
+      "[START_DIR]/cache/work/skia/bin/gn.exe",
       "gen",
-      "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
+      "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
       "--args=cc=\"clang\" clang_win=\"[START_DIR]/clang_win\" cxx=\"clang++\" extra_cflags=[\"-DDUMMY_clang_win_version=42\"] is_debug=false skia_enable_vulkan_debug_layers=false skia_vulkan_sdk=\"[START_DIR]/win_vulkan_sdk\" target_cpu=\"x86_64\" win_sdk=\"[START_DIR]/t/depot_tools/win_toolchain/vs_files/a9e1098bba66d2acccc377d5ee81265910f29272/win_sdk\" win_vc=\"[START_DIR]/t/depot_tools/win_toolchain/vs_files/a9e1098bba66d2acccc377d5ee81265910f29272/VC\""
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "name": "gn gen"
   },
@@ -149,14 +149,14 @@
       "-k",
       "0",
       "-C",
-      "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64"
+      "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64"
     ],
-    "cwd": "[CUSTOM_C:\\_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release_x64",
       "CHROME_HEADLESS": "1",
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
+      "SKIA_OUT": "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan"
     },
     "name": "ninja"
   },
@@ -165,7 +165,7 @@
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['bookmaker', 'dm', 'dm.exe', 'dm.app', 'nanobench.app', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', 'skpbench', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'skiaserve', 'lib/*.so', 'run_testlab', 'skqp-universal-debug.apk', 'whitelist_devices.json']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
-      "[CUSTOM_C:\\_B_WORK]/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
+      "[START_DIR]/cache/work/skia/out/Build-Win-Clang-x86_64-Release-Vulkan/Release_x64",
       "[START_DIR]/[SWARM_OUT_DIR]/out/Release_x64"
     ],
     "infra_step": true,
diff --git a/infra/bots/recipes/ct_skps.py b/infra/bots/recipes/ct_skps.py
index 85f6ce8080..d0864d52fd 100644
--- a/infra/bots/recipes/ct_skps.py
+++ b/infra/bots/recipes/ct_skps.py
@@ -40,6 +40,13 @@ TOOL_TO_DEFAULT_SKPS_PER_SLAVE = {
 DEFAULT_SKPS_CHROMIUM_BUILD = '2b7e85eb251dc7-a3cf3659ed2c08'
 
 
+def make_path(api, *path):
+  """Return a Path object for the given path."""
+  key  = 'custom_%s' % '_'.join(path)
+  api.path.c.base_paths[key] = tuple(path)
+  return api.path[key]
+
+
 def RunSteps(api):
   # Figure out which repository to use.
   buildername = api.properties['buildername']
@@ -71,6 +78,9 @@ def RunSteps(api):
   else:
     raise Exception('Do not recognise the buildername %s.' % buildername)
 
+  api.vars.override_checkout_root = make_path(api, '/', 'b', 'work')
+  api.vars.override_gclient_cache = make_path(api, '/', 'b', 'cache')
+
   api.core.setup()
   api.flavor.compile(build_target)
 
diff --git a/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit-Trybot.json b/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit-Trybot.json
index 161047a5db..c9a214fafd 100644
--- a/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit-Trybot.json
+++ b/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit-Trybot.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--gerrit_repo",
@@ -51,7 +51,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -124,7 +124,7 @@
       "0777",
       "[START_DIR]/[SWARM_OUT_DIR]/perfdata/Housekeeper-PerCommit/data"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "infra_step": true,
     "name": "makedirs perf_dir"
   },
@@ -141,7 +141,7 @@
       "--issue_number",
       "456789"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit.json b/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit.json
index c7cfb77fc2..099d0a74f7 100644
--- a/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit.json
+++ b/infra/bots/recipes/housekeeper.expected/Housekeeper-PerCommit.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -113,7 +113,7 @@
       "python",
       "RECIPE_MODULE[skia::core]/resources/generate_and_upload_doxygen.py"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -134,7 +134,7 @@
       "0777",
       "[START_DIR]/[SWARM_OUT_DIR]/perfdata/Housekeeper-PerCommit/data"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "infra_step": true,
     "name": "makedirs perf_dir"
   },
@@ -149,7 +149,7 @@
       "--dest",
       "[START_DIR]/[SWARM_OUT_DIR]/perfdata/Housekeeper-PerCommit/data/nanobench_9046e2e693bb92a76e972b694580e5d17ad10748_1337000001.json"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/infra.expected/failed_all_updates.json b/infra/bots/recipes/infra.expected/failed_all_updates.json
index 4b29cb9beb..c8086c0234 100644
--- a/infra/bots/recipes/infra.expected/failed_all_updates.json
+++ b/infra/bots/recipes/infra.expected/failed_all_updates.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
diff --git a/infra/bots/recipes/infra.expected/failed_one_update.json b/infra/bots/recipes/infra.expected/failed_one_update.json
index 4e3b09e266..9a53e59043 100644
--- a/infra/bots/recipes/infra.expected/failed_one_update.json
+++ b/infra/bots/recipes/infra.expected/failed_one_update.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -170,7 +170,7 @@
       "infra/bots",
       "test"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "GOPATH": "[START_DIR]/gopath",
       "GOROOT": "[START_DIR]/go/go",
diff --git a/infra/bots/recipes/infra.expected/infra_tests.json b/infra/bots/recipes/infra.expected/infra_tests.json
index f86eb5e7c6..7464a16695 100644
--- a/infra/bots/recipes/infra.expected/infra_tests.json
+++ b/infra/bots/recipes/infra.expected/infra_tests.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -47,7 +47,7 @@
       "--revision",
       "skia@abc123"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -148,7 +148,7 @@
       "infra/bots",
       "test"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "GOPATH": "[START_DIR]/gopath",
       "GOROOT": "[START_DIR]/go/go",
diff --git a/infra/bots/recipes/recreate_skps.expected/Housekeeper-Nightly-RecreateSKPs_Canary.json b/infra/bots/recipes/recreate_skps.expected/Housekeeper-Nightly-RecreateSKPs_Canary.json
index ac899f285e..55863cd4f2 100644
--- a/infra/bots/recipes/recreate_skps.expected/Housekeeper-Nightly-RecreateSKPs_Canary.json
+++ b/infra/bots/recipes/recreate_skps.expected/Housekeeper-Nightly-RecreateSKPs_Canary.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -49,7 +49,7 @@
       "--revision",
       "src@origin/lkcr"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -103,7 +103,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env": {
       "CPPFLAGS": "-DSK_ALLOW_CROSSPROCESS_PICTUREIMAGEFILTERS=1",
       "DEPOT_TOOLS_UPDATE": "0",
@@ -128,11 +128,11 @@
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/src/buildtools/linux64/gn",
+      "[START_DIR]/cache/work/src/buildtools/linux64/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/src/out/Release"
+      "[START_DIR]/cache/work/src/out/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/src",
+    "cwd": "[START_DIR]/cache/work/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -147,10 +147,10 @@
     "cmd": [
       "ninja",
       "-C",
-      "[CUSTOM_/_B_WORK]/src/out/Release",
+      "[START_DIR]/cache/work/src/out/Release",
       "chrome"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/src",
+    "cwd": "[START_DIR]/cache/work/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -190,15 +190,15 @@
   {
     "cmd": [
       "python",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/skp/create.py",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/skp/create.py",
       "--chrome_src_path",
-      "[CUSTOM_/_B_WORK]/src",
+      "[START_DIR]/cache/work/src",
       "--browser_executable",
-      "[CUSTOM_/_B_WORK]/src/out/Release/chrome",
+      "[START_DIR]/cache/work/src/out/Release/chrome",
       "--target_dir",
       "[START_DIR]/skp_output"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/recreate_skps.expected/Housekeeper-Weekly-RecreateSKPs.json b/infra/bots/recipes/recreate_skps.expected/Housekeeper-Weekly-RecreateSKPs.json
index 74af5ca935..b2a9b0e7ed 100644
--- a/infra/bots/recipes/recreate_skps.expected/Housekeeper-Weekly-RecreateSKPs.json
+++ b/infra/bots/recipes/recreate_skps.expected/Housekeeper-Weekly-RecreateSKPs.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -49,7 +49,7 @@
       "--revision",
       "src@origin/lkcr"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -103,7 +103,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env": {
       "CPPFLAGS": "-DSK_ALLOW_CROSSPROCESS_PICTUREIMAGEFILTERS=1",
       "DEPOT_TOOLS_UPDATE": "0",
@@ -128,11 +128,11 @@
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/src/buildtools/linux64/gn",
+      "[START_DIR]/cache/work/src/buildtools/linux64/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/src/out/Release"
+      "[START_DIR]/cache/work/src/out/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/src",
+    "cwd": "[START_DIR]/cache/work/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -147,10 +147,10 @@
     "cmd": [
       "ninja",
       "-C",
-      "[CUSTOM_/_B_WORK]/src/out/Release",
+      "[START_DIR]/cache/work/src/out/Release",
       "chrome"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/src",
+    "cwd": "[START_DIR]/cache/work/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -190,15 +190,15 @@
   {
     "cmd": [
       "python",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/skp/create.py",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/skp/create.py",
       "--chrome_src_path",
-      "[CUSTOM_/_B_WORK]/src",
+      "[START_DIR]/cache/work/src",
       "--browser_executable",
-      "[CUSTOM_/_B_WORK]/src/out/Release/chrome",
+      "[START_DIR]/cache/work/src/out/Release/chrome",
       "--target_dir",
       "[START_DIR]/skp_output"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -258,11 +258,11 @@
   {
     "cmd": [
       "python",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/upload_skps.py",
+      "[START_DIR]/cache/work/skia/infra/bots/upload_skps.py",
       "--target_dir",
       "[START_DIR]/skp_output"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
diff --git a/infra/bots/recipes/recreate_skps.expected/failed_upload.json b/infra/bots/recipes/recreate_skps.expected/failed_upload.json
index a8fe5b070b..d839cf0d6f 100644
--- a/infra/bots/recipes/recreate_skps.expected/failed_upload.json
+++ b/infra/bots/recipes/recreate_skps.expected/failed_upload.json
@@ -9,7 +9,7 @@
       "ensure-directory",
       "--mode",
       "0777",
-      "[CUSTOM_/_B_WORK]"
+      "[START_DIR]/cache/work"
     ],
     "infra_step": true,
     "name": "makedirs checkout_path"
@@ -22,10 +22,10 @@
       "--json-output",
       "/path/to/tmp/json",
       "remove",
-      "[CUSTOM_/_B_WORK]/.gclient_entries"
+      "[START_DIR]/cache/work/.gclient_entries"
     ],
     "infra_step": true,
-    "name": "remove [CUSTOM_/_B_WORK]/.gclient_entries"
+    "name": "remove [START_DIR]/cache/work/.gclient_entries"
   },
   {
     "cmd": [
@@ -33,13 +33,13 @@
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec-path",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
+      "cache_dir = '[START_DIR]/cache/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
       "--patch_root",
       "skia",
       "--revision_mapping_file",
       "{\"got_revision\": \"skia\"}",
       "--git-cache-dir",
-      "[CUSTOM_/_B_CACHE]",
+      "[START_DIR]/cache/git",
       "--cleanup-dir",
       "[CLEANUP]/bot_update",
       "--output_json",
@@ -49,7 +49,7 @@
       "--revision",
       "src@origin/lkcr"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env_prefixes": {
       "PATH": [
         "RECIPE_PACKAGE_REPO[depot_tools]"
@@ -103,7 +103,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[START_DIR]/cache/work",
     "env": {
       "CPPFLAGS": "-DSK_ALLOW_CROSSPROCESS_PICTUREIMAGEFILTERS=1",
       "DEPOT_TOOLS_UPDATE": "0",
@@ -128,11 +128,11 @@
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/src/buildtools/linux64/gn",
+      "[START_DIR]/cache/work/src/buildtools/linux64/gn",
       "gen",
-      "[CUSTOM_/_B_WORK]/src/out/Release"
+      "[START_DIR]/cache/work/src/out/Release"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/src",
+    "cwd": "[START_DIR]/cache/work/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -147,10 +147,10 @@
     "cmd": [
       "ninja",
       "-C",
-      "[CUSTOM_/_B_WORK]/src/out/Release",
+      "[START_DIR]/cache/work/src/out/Release",
       "chrome"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/src",
+    "cwd": "[START_DIR]/cache/work/src",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -190,15 +190,15 @@
   {
     "cmd": [
       "python",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/assets/skp/create.py",
+      "[START_DIR]/cache/work/skia/infra/bots/assets/skp/create.py",
       "--chrome_src_path",
-      "[CUSTOM_/_B_WORK]/src",
+      "[START_DIR]/cache/work/src",
       "--browser_executable",
-      "[CUSTOM_/_B_WORK]/src/out/Release/chrome",
+      "[START_DIR]/cache/work/src/out/Release/chrome",
       "--target_dir",
       "[START_DIR]/skp_output"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
@@ -258,11 +258,11 @@
   {
     "cmd": [
       "python",
-      "[CUSTOM_/_B_WORK]/skia/infra/bots/upload_skps.py",
+      "[START_DIR]/cache/work/skia/infra/bots/upload_skps.py",
       "--target_dir",
       "[START_DIR]/skp_output"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "cwd": "[START_DIR]/cache/work/skia",
     "env": {
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",